Yes, especially with measurable ammonia present. Try to match the temp within a couple of degrees, down a little wouldn't hurt, as someone else mentioned, cooler water can hold more oxygen.
I have (3) 1.5" AT's, (3) 1.5" IT's, (3) .5" NTT's, (2) 6" Angel fish, (4) 4" ID sharks. Recently I started feeding them market shrimp.. since they are all small, 1 Big shrimp is good enough for all of them but sometimes the ID's eats pellets and occasionally would have left over floating pellets.